Drive-chain.



No. 755.707. PATEN'I'ED' MAR... 29, 1904.

G. G. SCHMIDT, J11. DRIVE CHAIN.

APPLICATION FILED NOV. 27, 1903.

N0 MODEL.

: wfifieddca: (Viz/672K07 @ka mt. MQMM} v UNITED STATES Patented March 29, 1904.

CARL c. A. SCHMIDT, OF COLUMBUS, oHro.

DRIVE-CHAIN.

SPECIFICATION forming part of Letters Patent No. 755,707, dated March 29, 1904.

Application filed November 27,1903. Serial No. 182,7 24. (No model.)

1'0 all whom it may concern:

Be it known that LCARL G. A. SCHMIDT, Jr., of Columbus, in the county of Franklin and State of Ohio, have invented certain new and useful Improvements in Drive-Chains, of

which the following is a specification.

This invention relates to sprocket-chains composed of jointed links, which are formed to engage teeth of sprocket-wheels and impart motion from a driving-wheel to a driven wheel.

The invention has for its chief object to provide a simple, strong, and durable drivechain adapted for either low or high speed driving, which shall be free from liability to stretch under the strains exerted on the chain and in which the tooth-engaging faces of the chain shall be formed to'closely fit and firmly grasp the teeth of the sprocket-wheels, so that the links will have no tendency to slip from the teeth of the wheels.

The invention consists in the improved construction which I will now proceed'to describe and claim.

Of the accompanying drawings, forming a part of this specification, Figure 1 represents a side view showing a portion of a complete chain embodying my invention engaged with a driving sprocket-wheel. Fig. 2 represents a side elevation of one of the links of the chain. Fig. 3 represents a back view of a portion of the chain.

The same reference characters indicate the same parts in all the figures.

In the drawings, a (4 represent the links of my improved chain, each link being preferably a fiat blank of steel having orifices 22in its end portions for the reception of transverse pins 6, which pivotally connect the overlap link is provided at the end portions of its inner edge with two faces 6 6,which are substantially straight and obliquely arrangedthat is to say, the line of each face if extended inwardly toward the opposite end of the link preferably intersects the orifice 2 in the opposite end of the link, as indicated by dotted lines in Fig. 2. Thisform and disposition of the faces 6 6 causes the faces of two adjacent links in a portion of the chain which is curved on a sprocket-wheel c to conform to the outer end of a tooth c of the sprocket-wheel. Each link is provided at its inner edge witha projection 7 which is located between the faces 6 6 and is offset from the body portion of the linknamely, the portion intervening between the orifices 2 2. The said projection is provided with end faces or shoulders 8 8, which are so disposed and formed that in the said curved portion of the chain the opposed shoulders 8 on tWo adjacent projections conform closely to the sides of a wheel-tooth c, as indicated in Fig. 1, the sides of said .tooth being of the usual form.

It will be seen that the portion of the chain which is engaged with a sprocket-wheel accurately fits the teeth of the wheel, so that the chain has a firm and effective engagement with the wheel. conforming closely to the outer ends of the teeth 0 enable the links to be made of minimum width from their inner to their outer The oblique faces 6 of the links edges, the pins 6 being in close proximity to c the outer ends of the gear-teeth. The end faces or shoulders 8 8 are enabled by the oblique faces 6 6 to bear effectively on the sides of the teeth 0, the entire lengthof each face or shoulder 8 being utilized as a toothengaging face or surface. Hence the width of the projection 7 may be reduced to the minimum without sacrificing the effectiveness of the engagement between the chain and the wheel. It will be observed that the wheeltooth-engaging projection 7 is at one side of the bodyof the link and between the ends of the link, so that the full strength of said body,

acting portion of the chain is particularly useful in cases where the chain is somewhat loose, the said arrangement causing the chain to firmly grip the teeth 0.

Each pin 6 is reduced in diameter at the end that engages the washer 4 to provide a shoulder 9,bearing on the inner side of the washer. Said shoulder prevents the links from being jammed or crowded together between the head 3 and washer 4.

I claim A sprocket-chain comprising flat links having end portions which are pivotally connected by transverse pins,each link having oblique faces at the end portions of its inner edge,disposed so that in a portion of the chain which is curved on a sprocket-wheel, two of said faces on adjacent links conform to the outer end of a toothof said wheel, each link having also a projection on its inner edge, located between the said oblique faces, said projection having end faces or shoulders, which are so disposed that in the said curved portion of the chain, the opposed shoulders on two adjacent projections have an extended bearing on the sides of a tooth of the wheel.

In testimony whereof I have affixed my signature in presence of two witnesses.

CARL Gr. AQSCHMDT, JR. Witnesses:

CHAs. M. SNIDER, J. M. FURNAs. 

